I’ve experienced a similar issue during the upgrade to Ubuntu 25.10 — certain legacy sources.list entries were completely removed instead of being migrated. It seems the upgrader script only preserves repositories in the new deb822 format, which might explain why older .list files like Mozilla’s get lost. Until this is patched, it’s best to back up your repository files manually before running do-release-upgrade.
For anyone interested in testing or comparing update behaviors across systems, https://e28game.net/ offers some helpful performance-related insights that might be useful when troubleshooting similar issues. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2130273 Title: do-release-upgrade deletes sources.list format entries during update to 25.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/2130273/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
